Pump



R. L. NELSON PUMP Nov. 18, 1947.

when WEL slm PatentedrNov. 18, 1947 UNITED STATES PATENT OFFICE 9Claims.

My invention relates to improvements in pumps and particularly to areciprocating pump structure for pumping operations requiring theapplication of high uid pressure and accurate regulation of the output.

The primary object of my invention is to provide a simple yet positivepiston operating mechanism whereby the length of the stroke imparted tothe piston may be varied as and when desired to meet exactingrequirements in output, as, for example, in the pumping of smallquantities of concentrated substances into fluid systems of greatcapacities and at high pressures, and particularly where the pump isrequired to maintain a constant pumping rate under varying operatingconditions for long periods of time,

A further object of my invention is the provision of a combined pumpstructure and piston rod operating mechanism in which the pistonoperating means and the means for adjusting the stroke imparted to thepiston on each operation of the mechanism is completely enclosed andconcentrically arranged within an extension of the pump body whichserves also as a bearing support for the mechanism.

Another object of my invention is the provision of a compact unitarystructure in which all of the operating parts are concentric andarranged for assembly from one end of the pump body.

Still another object of my invention is the provision of a pump of thischaracter having readily adjustable means connecting the piston plungerand its operating rod for varying the stroke imparted to the piston bythe rod, the parts being concentric with the axis of the piston plunger.

A further object of my invention is the provision of a pump in which thestroke of the piston plunger may be varied at will, and where the pistonplunger operating means is reciprocably mounted in one end of the pumpbody with means for adjusting its operative relation with the pistonplunger for producing desired lost motion between the two.

A still further object of my invention is the provision of a pump havinga pump plunger and an operating rod having a lost motion connection.therewith with slide bearing means for reciprocably supporting the rodin axial alignment With the pump plunger, and piston stroke varyingmeans adjustably connecting the rod, bearing and piston plunger inconcentric arrangement,

Other objects of my invention relate to a greatly simplied, variablestroke pump structure in v small bore I I.

which the operating parts are enclosed and lubricated from a singlesource for more positive and reliable operation of the pump, etc., al1as will be hereinafter more fully described in connection with theaccompanying drawings, wherein- Figure 1 is a side elevation of my pumpstructure illustrating the compact, concentric arrangement of the parts;

Fig. 2 is a verticaI section taken longitudinally through the structureof Fig 1, with certain of the parts shown in elevation, and the partsadjusted for minimum lost motion between the piston rod and pistonplunger;

Fig. 3 is a fragmentary View taken transversely through the structure atthe position indicated by 3-3 of Fig. l; and

Fig, 4 is another fragmentary View taken longitudinally through thestructure of Fig. 1 with the parts adjusted for maximum lost motionbetween the parts to produce minimum piston stroke.

Referring now in detail to the drawings, the pump proper comprises acylindrical body I0, through the center of which extends a relativelyThis bore is shown as communieating with a right angularly disposed boreI2 extending through one end of the body IB and in opposite ends of thebore I2 are removably mounted valve iittings I3 and I4. Plug type valvesI5 and I6 are shown slidably mounted respectively in the close fittingbores of the ttings I3 and I4, and each of theservalves is preferablyformed With a cylindrical body portion having riiiied passages I'I andI8 in the surface thereof to cause the valves to turn about their aXesduring operation of the pump for better seating of the valves.

At the opposite end of the pump body or barrel I0 the bore II isenlarged as shown at I9 to provide a. packing gland for` the receptionof suitable packing material 20. From the gland i9 the bore is furtherenlarged toward that end of the body to provide an adjoining chamber 2lof a size to freely receive a pair of opposed packing materialcompressing and retaining collars 22 and 23. These collars are bored toslidably receive the piston plunger 24. Just inwardly of the end of thebody IE) the bore is again enlarged from the chamber 2l, and internallythreaded as at 25 to provide a screw fitting to receive the threaded end26 of the cylindrical body extension or casing 21. As clearly shown inthe drawing this cylindrical casing 21 is concentric with the borethrough the body .I0 and its outer surface forms an unbrokencontinuation of the body when all the parts are in the assembledposition shown in Fig. 1. As shown in Fig. 2, the threaded end 26 of thecasing is centrally bored, as at 28, to slidably receive the pistonplunger 24, and as in the case of the body II! this bore 24 is enlargedto provide a packing gland 29 for holding packing material 30 around thepiston plunger 24. Thus the gland bores I9 and 29 are axially alignedwith the piston plunger bores 28 and I I, and the packing material 23and 30 is therefore held under a desired compression around the pistonplunger 24, under the action of a coil spring 3I which is compressedbetween opposed faces of annular flanges extending around each of thecollars 22 and 23, when the threaded ends 28 of the casing 21 is screwedinto seated position in the body I9. Lubricant may be supplied to thechamber 2I when closed by the end extension 216, through a suitablegrease fitting 32 for the lubrication of the parts just described.

As shown in Fig. 2, the outer end of the piston plunger 24 is providedwith an enlarged operating head, preferably of hardened material, havinga rounded outer surface 33 and a plain or flat annular inner surface 34.These two operating surfaces of the plunger head are adapted tocooperate with two relatively opposed parts 35 and 36 of a pistonoperating rod assembly, designated generally as 31, when the rod isreciprocated in the bore of the casing 21.

As stated above, the piston plunger 24 is reciprocably arranged withinthe bore I I of the body I where its fluid compressing end or head 24 isadaptedto always move to and from the extreme end of the pumpingcylinder or bore I I, designated by the juncture of this bore with thecross bore I2. At the opposite end of the piston plunger are arrangedthe two faces of the operating head, and the intermediate portion of thepiston plunger is adapted to be frictionally held within the cylinderbore I I by the spring pressed packings 20 and 3D, which in operationserve as a brake device to retain the piston plunger in any desiredadvanced or retracted position at which it may be stopped until force isagain applied by the piston operating rod assembly now to be describedin detail.

The detachable casing 21, which in assembled position forms asymmetrical extension 0f the pump barrel I0, is axially bored inwardlyfrom the end opposite the extension 26 to provide an inner cylindricalguideway 38 for a cylindrical slide bearing member 39 thatconcentrically surrounds the outer headed end 33 of the piston plunger24.

As shown in Fig. 2, the headed end of the piston plunger extends amaterial distance into the center of the casing 21, which casing is openat its opposite end. Axially aligned with the piston plunger 24, withinthe slide bearing member 39, is a piston rod 49, and as shown the outerend of this rod may be provided with a yoke or other connecting linkmember 4I, by which the rod is connected to a suitable source of power,such as a cam shaft or other eccentric (not shown), by which a xedpredetermined operating `stroke is imparted to the rod. The forward endportion of the rod body 40 is threaded as at 42 and the inner surface ofthe slide bearing sleeve 39 is similarly threaded as at 43 to receivebetween them an interiorly and exteriorly threaded sleeve 44 thatprovides a positive concentric connection between these parts so thatunder all operating conditions the rod and slide bearing move togetheras a unit.

however, the slide bearing may be held against rotation in thecylindrical casing by a machine screw S, the inner end of which worksfreely in a longitudinal guideway 45 in the outer surface of the bearingsleeve 39, as is best shown in Figs. 2 and 3.

Relative longitudinal adjustment may thus be made between the rod 4U andthe slide bearing 39 by turning the rod in the connecting sleeve 44.VThis adjustment is of primary importance in initially setting thehammer end 35 of the rod 49 to move the piston plunger to the extremeinner end of the pump b-arrel or bore I I. From this position of theiiuid compressing end 24 of the piston 24 the stroke of the pistonplunger may be regulated according to demands in output of the chamberby turning the connecting or stroke varying sleeve 44 in a direction toincrease or decrease `the distance between the opposed piston operatingparts 35 and 36 of the assembly 31, as shown in Figs. 2 and 4. In Fig` 2the parts just described are shown adjusted for minimum lost motionbetween the rod 49 and pump plunger 24 so as to impart a maximum stroketo the piston, whereas in Fig. 4 the parts are adjusted for maximum lostvfriction, for minimum piston stroke.

From the .two positions just described, it will be obvious that anydesired adjustment of the piston stroke may be .made and the adjustingparts set by tightening the set screws 49.

As shown particularly in Fig. 1, the stroke adjusting sleeve 44 is of alength to project a material distance beyond the open end of the tubularsupporting casing 21. The outer end portion of this adjusting sleeve 44is preferably provided with a plain cylindrical surface excepting forthe annular series of bosses 41 between which a wrench may be engaged toturn the-sleeve relative to the piston rod 4I! and its slide bearing 39to adjust the lost motion relation between the piston plunger operatingsurfaces 35 and 33, above explained.

From the foregoing, it will be observed that a novel pump and operatingmeans therefore is provided by the combination and arrangement of partsshown; further that the unit produced is simple in construction, durablein use and readily assembled and disassembled due to the concentricarrangement of parts and their location at one end of the pump barrel asa symmetrical extension thereof.

While I have described but a single specific embodiment of my inventionthe same is to be considered as `illustrative only and not restrictive,the scope of the invention being defined in the sub-joined claims.

What I claim is:

1. In a reciprocating pump, a pump barrel, a piston plungerreciproc'able 1within the barrel, a piston rod aligned with said plungerfor moving the plunger in one directiorna stroke adjusting sleevesurrounding the adjacent end portions of said rod and plunger andadjustably connected to the rod for engaging and moving the pistonplunger in the opposite direction with lost motion therebetween, anda'bearing sleeve carried by the adjusting sleeve and adjustable relativethereto for slidably supporting the piston rod.

.2. In a reciprocating pump, la pump barrel, a piston plungerreciprocable within the barrel, a piston rod aligned with said plungerfor moving the plunger in one direction, a stroke adjusting sleevesurrounding the adjacent end portions of Forpurpose of adjustmentbetween these parts, '-75 said rod and plunger and adjustably connectedto the rod for engaging and moving the piston plunger in the oppositedirection with lost motion therebetween, said barrel having acylindrical extension concentrically surrounding the adjusting sleeve,and a slide bearing sleeve adjustably carried by the adjusting sleevereciprocably mounted in the barrel extension.

3. In a reciprocating pump, a pump barrel, a piston plunger reciprocablewithin the barrel, a piston rod aligned with said plunger for moving theplunger in one direction, a stroke adjusting sleeve surrounding theadjacent end portions of said rod and plunger and adjustably connectedto the rod for engaging and moving the piston plunger in the oppositedirection with lost motion therebetween, said barrel having acylindrical extension concentrically surrounding the adjusting sleeve, aslide bearing sleeve adjustably carried by the adjusting sleevereciprocably mounted in the barrel extension, and a key and guidewayconnecting the slide bearing sleeve and barrel extension.

4. In a reciprocating pump, a pump barrel, a piston plunger reciprocablewithin the barrel, a piston rod aligned with said plunger for moving theplunger in one direction, a stroke adjusting sleeve surrounding theadjacent end portions of said rod and plunger and adjustably connectedto the rod for engaging and moving the piston plunger in the oppositedirection with lost motion therebetween, said barrel having acylindrical extension concentrically surrounding the adjusting sleeve, aslide bearing sleeve adjustably carried by the adjusting sleevereciprocably mounted in the barrel extension, a key and guidewayconnecting the slide bearing sleeve and barrel extension, and means atthe outer end of the adjusting sleeve for adjusting it relative to thepiston rod and bearing sleeve.

5. In a reciprocating pump, a pump barrel, a piston plunger reciprocablewithin the barrel, a piston rod aligned with said plunger for moving theplunger in one direction, a stroke adjusting sleeve surrounding theadjacent end portions of said rod and plunger and adjustably connectedto the rod for engaging and moving the piston plunger in the oppositedirection with lost motion therebetween, said barrel having acylindrical extension concentrically surrounding the adjusting sleeve, aslide bearing sleeve adjustably carried by the adjusting sleevereciprocably mounted in the barrel extension, a key and guidewayconnecting the slide bearing sleeve and barrel extension, means at theouter end of the adjusting sleeve for adjusting it relative to thepiston rod and bearing sleeve, and means also at the outer end of saidadjusting sleeve for securing the parts in adjusted position.

6. In a reciprocating pump, a pump barrel, a piston plunger reciprocablewithin the barrel, a piston rod aligned with the piston plunger andmovable relative thereto for moving the piston plunger in one direction,a stroke adjusting sleeve having threaded engagement with the pistonrod, and said sleeve having an abutment portion extending beyond the endof the piston rod for lost motion engagement with the piston plunger formoving the piston plunger in the opposite direction.

7. In a reciprocating pump, a pump barrel, a piston plungerreciproca-ble within the barrel, a piston rod aligned with the pistonplunger and movable relative thereto for moving the piston plunger inone direction, a stroke adjusting sleeve having threaded engagement withthe piston rod, said sleeve having an abutment portion extending beyondthe end of the piston rod for lost motion engagement with the pistonplunger for moveing the piston plunger in the opposite direction, and aslide bearing sleeve having threaded engagement with the strokeadjusting sleeve for reciprocably supporting the piston rod.

8. A reciprocating pump comprising a pump barrel having a cylindricalguideway at one end thereof, a piston plunger reciprocable within thebarrel and extending axially into the guideway, means for actuating saidpiston plunger with lost motion between the two, including an operatingrod axially aligned with the piston plunger for moving the piston in onedirection, and a piston stroke adjusting sleeve concentrically andadjustably carried by said rod within the guideway and cooperating withsaid piston plunger to move same in the opposite direction.

9. A reciprocating pump comprising a pump barrel having a cylindricalguideway at one end thereof, a piston plunger reciprocable within thebarrel and extending axially into the guideway, means for actuating saidpiston plunger with lost motion between the two, including an operatingrod axially aligned with the piston plunger for moving the piston in onedirection, a piston stroke adjusting sleeve concentrically andadjustably carried by said rod within the guideway and cooperating withsaid piston plunger to move same in the opposite direction, and a slidebearing sleeve concentrically and adjustably carried by the strokeadjusting sleeve and having sliding engagement within the cylindricalguideway.

REUBEN L. NELSON.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 2,257,387 Kinkade et al. Sept.30, 1941 2,291,889 Evans et al, Aug. 4, 1942 2,157,970 Rowland et al.May 9, 1939 2,126,092 Corydon Aug. 9, 1938 2,130,521 Brunnes Sept. 20,1938

